You might have more than one problem,according with what are you describing.The strong hum could come from the bearings.When the sound increase when you take a gradual right,that noise is coming from the axel.So you have to check if the cv boot (of the axel) is broken,because that what is happening ...the cv joint colect dirt,and there is no grease,and in the moment when you take a turn the joints come in to a friction and creat the noise you are hearing.Definetly the hum noise is coming from the bearings.
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